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VoIP
& Virtualization

VoIP and Virtualization

Unified communications infrastructures such as VoIP
and server virtualization have not been bedfellows until recently.
That was mainly because real-time communications demanded higher performance
levels than could be well-accommodated by simple Web applications.
However, the PBX system is no longer the separate proprietary system it used to
be.

This does not mean that all types of VoIP software can be virtualized. Some
vendors use programs that only run well on proprietary servers.
Nevertheless, there are many vendors who run their VoIP software on standard
Windows or Linux systems, which can be virtualized with relative ease.

Functions of a VoIP Server

The resources in many data centers are underutilized and virtualizing the call
manager servers can be of greater benefit. The VoIP server largely remains
idle during calls because the path of speech does not use it. The server
is only used during the initial seconds when a call is being set up and the last
few seconds of a call.

The VoIP server does not function as the traditional PBX box. It only
helps to control calls when it communicates with softphones, IP phones, gateways
and other endpoints to establish a call. The endpoint uses a signaling
protocol to communicate with the server by sending a packet of call request.
The server then establishes the call by getting in touch with the other
endpoint.

The VoIP server essentially gets out of the way after establishing the call,
which operates in a peer-to-peer connection that does not require the server.

The call manager resources do not get fully utilized even during the busiest
times. The server uses between six and 10 packets for each call attempt.
If the server sets up 1000 calls within an hour, it makes an average of between
two and four packets per second. It also receives the same number of
packets at the end of the call. The traffic remains negligible
irrespective of the size of a call center.

Advantages of Virtualizing VoIP

Taking VoIP into the virtual environment helps to do away with the waste of
call manager resources.
Dell Server virtualization helps to lower the
number of servers required, which in turn reduces cooling and power
requirements.

As more vendors shift to the use of multi-platform software, VoIP virtualization
becomes a more attractive option.